select a slice of the wall of a cane stalk from your cane
field.
Wet the slice with water an fold it over double.
Using thread, bind the ends of the cane round a thin tube.
Cut the now-double reed to the desired length.
Talking your special scraping tools, scrape the new ends of the two
halves until they're just the right thickness. Caution : They should
not be too thin or too thick; just right is what you're aiming for here.
Repeat several hundred thousand times over a 20 year period until you
have the perfect knack.
(* Or just buy the cane from a music supply store)